Septation of the ventricle

Question 1

To review the process of passive septa@on: The I-­‐V Septum represents an area that does not grow at the same accelerated rate as does the tissue to either side of it. The result is that as the right and left ventricles continue to dilate they form a medial wall between them which fuses to become the I-­‐V Septum. Occasionally the medial walls do not fuse, leaving a deep apical cleft on the outside of the heart. This observation is called a ?

Answer 1

Bifid Apex

Question 2

As stated earlier a passively formed septum can never be complete. The Muscular I-­‐V Septum relies on contributing tissue from the inferior ____ ____ to form the Membranous I-­‐V Septum.)

Answer 2

endocardial cushions

Question 3

Ennlargement of the ventricles is accomplished by a centrifugal growth of the myocardium, always closely followed by increasing diverticulation and formation of trabeculae internally; this prevents the compact outer layer of the heart from ?

Answer 3

becoming too thick and solid

Question 4

While in the human heart, most of the trabeculae eventually disappear, some remain and coalesce to form larger structures such as the

Answer 4

Papillary Muscles
Moderator and Septal Band
Chordae Tendineae.

Question 5

At the end of the 4th week (approximately 27 days)

Answer 5

two pairs of mesenchymal cushions appear in the A-­‐V Canal.
- The Superior and Inferior Endocardial Cushions

• Lateral Endocardial Cushions .